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TL431LI

AKTIV

Einstellbarer Präzisions-Shunt-Regler mit optimiertem Referenzstrom (Pin-Layout: KRA)

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TLA431 AKTIV Vollständig kondensatorstabile, präzise programmierbare Referenz mit KRA-Pin-Layout Improved to all load cap stability, improved temperature drift, decreased minimum cathode current

TL431LI

AKTIV
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Produktdetails

Rating Catalog VO (V) 2.495 Initial accuracy (max) (%) 0.5, 1 Iz for regulation (min) (µA) 400 VO adj (min) (V) 2.495 VO adj (max) (V) 36 Reference voltage (V) adjustable Temp coeff (max) (ppm/°C) 63 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 15
Rating Catalog VO (V) 2.495 Initial accuracy (max) (%) 0.5, 1 Iz for regulation (min) (µA) 400 VO adj (min) (V) 2.495 VO adj (max) (V) 36 Reference voltage (V) adjustable Temp coeff (max) (ppm/°C) 63 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 15
SOT-23 (DBZ) 3 6.9204 mm² (2.92 mm × 2.37 mm)
  • Reference Voltage Tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
  • Minimum Typical Output Voltage: 2.495 V
  • Adjustable Output Voltage: Vref to 36 V
  • Operation From −40°C to +125°C (Q Temp)
  • Maximum Temperature Drift
    • 10 mV (C Temp)
    • 17 mV (I Temp)
    • 27 mV (Q Temp)
  • 0.3-Ω Typical Output Impedance
  • Sink-Current Capability
    • Imin = 1 mA (max)
    • IKA = 15 mA (max)
  • Reference Input Current IREF: 0.4 µA (max)
  • Deviation of Reference Input Current over Temperature, II(dev): 0.3 µA (max)
  • Reference Voltage Tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
  • Minimum Typical Output Voltage: 2.495 V
  • Adjustable Output Voltage: Vref to 36 V
  • Operation From −40°C to +125°C (Q Temp)
  • Maximum Temperature Drift
    • 10 mV (C Temp)
    • 17 mV (I Temp)
    • 27 mV (Q Temp)
  • 0.3-Ω Typical Output Impedance
  • Sink-Current Capability
    • Imin = 1 mA (max)
    • IKA = 15 mA (max)
  • Reference Input Current IREF: 0.4 µA (max)
  • Deviation of Reference Input Current over Temperature, II(dev): 0.3 µA (max)

The TL431LI device is a three-terminal adjustable shunt regulator, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.495 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.3 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. This device is a pin-to-pin alternative to the industry standard TL431, with optimized Iref and IIdev performance. The lower Iref and IIdev values enable designers to achieve higher system accuracy and lower leakage current. The TL432LI device has exactly the same functionality and electrical specifications as the TL431LI device, but has a different pinout for the DBZ package.

The TL431LI device is offered in two grades, with initial tolerances (at 25°C) of 0.5% and 1%, for the B and A grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.

The TL43xLIxQ devices are characterized for operation from –40°C to 125°C.

The TL431LI device is a three-terminal adjustable shunt regulator, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.495 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.3 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. This device is a pin-to-pin alternative to the industry standard TL431, with optimized Iref and IIdev performance. The lower Iref and IIdev values enable designers to achieve higher system accuracy and lower leakage current. The TL432LI device has exactly the same functionality and electrical specifications as the TL431LI device, but has a different pinout for the DBZ package.

The TL431LI device is offered in two grades, with initial tolerances (at 25°C) of 0.5% and 1%, for the B and A grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.

The TL43xLIxQ devices are characterized for operation from –40°C to 125°C.
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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt TL431LI / TL432LI Programmable Shunt Regulator with Optimized Reference Current datasheet (Rev. A) PDF | HTML 12.11.2018
Anwendungshinweis Precision Current Sources and Sinks Using Voltage References (Rev. A) PDF | HTML 15.04.2026
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Anwendungshinweis Voltage Reference Selection and Design Tips For Data Converters (Rev. B) PDF | HTML 09.01.2024
Anwendungshinweis Optimization of a Shunt Reference for Flyback Converters PDF | HTML 18.10.2023
Anwendungshinweis Designing Stable Isolated Power Supplies with Shunt Regulators PDF | HTML 29.12.2022
Anwendungshinweis IEEE 802.3cg 10BASE-T1L Power over Data Lines Powered Device Design (Rev. A) PDF | HTML 02.06.2022
Anwendungshinweis Voltage and Processor Monitoring Solutions in Factory Automation and Control App (Rev. A) 05.08.2021
Analog Design Journal High-power, low-cost, discrete linear pre-regulator for automotive rear lights 21.12.2020
Technischer Artikel How modern voltage references help shrink small designs PDF | HTML 01.06.2020
Anwendungshinweis Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) 11.12.2019
Auswahlhilfe 431 Device Nomenclature (Rev. B) 18.09.2019
Application brief An Isolated 24 V Power Supply Window Monitor 01.08.2019
Anwendungshinweis Designing With the Improved TL431LI (Rev. A) 28.06.2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28.06.2019

Design und Entwicklung

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Evaluierungsplatine

ATL431EVM-001 — ATL431 einstellbarer Shunt-Regler – Evaluierungsmodul

The ATL431EVM-001 evaluation module (EVM) features the functionality and adjustability of the ATL431 by letting you program the cathode voltage with various resistor values. You can also set the cathode current using the various resistors in series with the supply. (...)

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TL431LI and ATL431LI PSpice Average Model

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TL431LI and ATL431LI Unencrypted PSpice Average Model

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TL431LI PSpice Transient Model

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TL431LI Unencrypted PSpice Transient Model

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Berechnungstool

SHUNT-REFERENCE-CALC — Shunt Reference Selector and Design Calculator

This tool guides the user through the design process for the TLx431 and LM40x0 family of shunt voltage references. This calculator will recommend resistance and capacitance values to optimally meet the user's desired specifications.
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